Microsoft Azure Depth Platform blog publishes a post on iToF pixel scaling. Few quotes:

“Given we are at the upper limits of MC [Modulation Contrast] and QE, as pixel area is reduced by half, the temporal jitter increases by √2. Does that mean smaller pixels are doomed to poor performance? It turns out there is another lever to improve performance and that is modulation frequency.

So, it would seem like you can recover the performance drop that occurs due to reducing pixel size by increasing the frequency (Figure 2). However, this is only possible if the modulation contrast (MC) doesn’t significantly degrade with higher frequencies.

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